210 



BULLETIN OF THE 



Patula perspectiva. 



striatella. 

 Helix lineata. 



labyrinthica. 



Dorfeuilliana. 



leporina. 



auriformis. 



stenotrema. 



hirsuta. 



monodon. 



palliata. 



obstricta, 



appressa. 



inflecta. 



trident ata. 



fallax. 



albolabria. 



multilineata. 



Pennsylvanica. 



Mitchelliaua. 



elevata. 



exoleta. 



dentifera. 



thyroides. 



clausa. 



Helix profunda. 

 Sayii. 

 harpa. 

 pulchella. 

 Pupa muscorum. 

 pentodon. 

 fallax. 

 armifera. 

 contracta. 

 rupicola. 

 corticaria. 

 Vertigo milium. 



ovata. 

 Succinea retusa. 



Grosvenori. 

 Mooresiana. 

 ovalis. 

 lineata. 

 avara. 

 aurea. 

 obliqua. 

 Totteniana. 

 Tebennophorus Caroliniensis. 

 Pallifera dorsalis. 



The above list shows the Interior Region to be remarkable for the 

 development of the section of Zonites familiar by the European Z. oli- 

 vetorum (Mesomplux of Alb. ed. 2). In the genus Helix the section or 

 subgenus Mesodon is most developed. This is almost exclusively a 

 North American subgenus, as is also Triodopsis, which is also greatly 

 developed in the Interior Region. 



In addition to the species included in the above list as inhabiting all 

 of the Interior Region, there is a large group of species found within 

 its limits, but having a more restricted range. They are found in what 

 may be called the Cumberland Sub-Region. This is comprised in the 

 southern portion of the Appalachian chain, situated in Eastern Tennes- 

 see and the adjoining counties of North Carolina, with an offshoot into 

 the mountains of West Virginia.* 



* For a description of its physical ami climatic characters, see Dr. A. Binney, 

 Terr. Moll. U. S., I. 122. It is there designated as the Southern Interior Section, 

 and is given a wider western range. 



